Let's keep a focus on the Cardinal's brand of ecumenism. I'd be willing to be sidetracked eventually, but just for now...
As a traditional Catholic myself, I am the first one to have a sensitive side toward the false ecumenism of priests, bishops, cardinals and the pope.
However, let's keep this in mind. First, dialogue with Muslims is NOT ecumenism--as that is reserved for non-Catholic Christians, and for some reason, the Jews. Second, if the Catholic Church is going to have any "liberty" at all to teach in non-Catholic countries, it had better continue to "beat the drum" for religious liberty, even if the real meaning is limited to allowing teaching the Catholic Faith. Without at least a "civil right" to religious liberty, the Church will cease to be allowed to teach in Israel and in newly-formed Islamic governments, which will happen increasingly in yours and my lifetime. This "right," properly understood (which is NOT the same meaning of religious liberty or religious freedom that is condemned in the 19th and early 20th centuries), is solely for allowing the truth to be promulgated in hostile nations. In fact, DH itself, states within the first few paragraphs that "the traditional teaching on religious liberty" is to be maintained. So anyone (liberal or traddie) who reads the document without the traditional understanding in mind, is not reading it according to the mind of the Church.
I see very little wrong with anything Cardinal Tauran said in this address. How are we going to win any adherents or favorable ears in the Muslim world without these sorts of symposiums? Perhaps he should just go and state Unam Sanctam, ask them to repent and convert, and then turn around and walk out? I'm sure that will accomplish a lot toward calming flames of Islam. I'm not certain these methods will do a whole lot of good, but we can always speculate that whatever happens in the class of civilizations in the future, it could have gotten worse faster without these sort of "reflections" and "dialogues."